Pinterest to Amazon: no pinning for you on Black Friday!

Traffic is generally a good thing for websites. But perhaps Pinterest, which has been called the third most popular social network after Facebook and Twitter, has enough.

The legendary pivot: How Twitter flipped from failure to success [video]

From Odeo and podcasts to a hackathon and the first seeds of what would become a globe-spanning social network, the Twitter creation story is perhaps the best-known example of the now-legendary startup pivot, the change that makes all the difference.

Twitter: A rule is a rule is a rule is a rule (except when we don’t want it to be)

But it's not the written rules that are the problem. It's the unwritten ones.

Twitter introduces new ‘tweemail’ feature (no, this has nothing to do with ‘Survivor’)

So you want to share that tweet, but don't want to retweet. And you don't want to copy, paste, and email, or take a screenshot and send it. Twitter will soon have a solution for you.

BeauCoo launches mobile fashion network for real women, with real bodies

It may be shocking to some men -- or at least advertising art directors -- but not all women have the stereotypical Barbie dimensions. Or the Twiggy lack thereof.

Candid talk from entrepreneur Gina Bianchini on how not to f*** up

The founder of the Ning social networking platform and MightyBell offers candid advice about failure.

Facebook, Twitter, and teens: who’s winning the youth war

Sure, Facebook is the world's largest social network -- and the one currently ranked highest by teens. But don't count the little blue bird out yet: Twitter just might be winning the youth numbers game.

Clarizen integrates “the biggest social network on the planet” into project management

More than 294 billion emails are sent every single day. And if Avinoam Nowogrodski has his way, that will continue for a long time to come.

MyBreastCancerTeam offers community, support, and social media to women facing breast cancer

MyBreastCancerTeam is the Facebook, Twitter, Yelp, Reddit, and Pinterest for women with breast cancer

Path founder Dave Morin constructs an oasis on the chaotic streets of ‘Facebook city’

Path founder Dave Morin talks about creating a safe space within the Facebook 'city.'

Yammer and Salesforce are now tracking your office banter

Following in Yammer's footsteps, Salesforce announced an integration to monitor office conversations on Chatter, its enterprise social network.

Now with more than 100M users, IMVU’s move from virtual world to social service a success

Launched when virtual worlds such as Second Life were popular, IMVU has made the transition from glorified chat room to social game service.

Want extra credit? Professors can now track who’s reading on Academia.edu

Academia.edu launches analytical dashboard for professors to track who's reading their research.

Diaspora sister site, Makr, launches with Facebook integration (updated)

The founders of the social network once touted as the “anti-Facebook” have a new creation for you make that new silly LOLcat you found or crazy celebrity pic go viral.

Makr, a newly-launched image remixing website, is the creation of …

Capcom reveals ResidentEvil.net, a social network and accompanying smartphone app

Capcom is launching a web hub for Resident Evil 6 that will connect gamers and allow them to compete in special events.

Google+ studio mode hangouts: awesome if you’re wearing headphones

Music over online conference lines or video-conferencing software mostly sucks -- because the conferencing world is optimized for voice, not song.

Google's trying to change that -- and bolster its social network, Google+ -- by adding Studio Mode to Hangouts on Air. Call it the MySpace gambit: if we bring the bands, the fans will follow.

Take that, Facebook: New social utility App.net blasts through $500K funding goal

Social sans commerce: here we come.

The new social utility that serial entrepreneur Dalton Caldwell started in response to being, in his words, screwed by Facebook, is live. App.net, which Caldwell ran a Kickstarter-ish campaign to fund, blew through its $500,000 goal and currently sits at $595,150.

Why are you not on Facebook, you psychopath?

Dark Knight theatre shooter James Holmes? Not on Facebook. Norwegian neo-Nazi mass murderer Anders Brievik? Also not on Facebook.

What about you?

Normal, of course, changes with times and trends. And in a world in which 955 million people are …